If you click through to their trust page, those ratings are from 2014 and 2015. I haven't used HitBTC myself, but I know a lot of people that use it and I rarely hear of any issues. That being said, your mileage may vary, and all of these altcoin exchanges should be approached with a healthy dose of paranoia. Don't risk more than you're willing to lose there.
Any hints or recommendations?
Thx & cheers
Whenever possible, I use a service like Shapeshift or Changelly over depositing to an exchange, trading and withdrawing. The process is much faster, and there is no possibility per their terms (at the moment) of withholding payments without KYC. Getting your account locked with funds inside and being forced to KYC is always a possibility on exchanges. Plus, the less time a third party holds your funds, the better, so Shapeshift and Changelly have the exchanges beat for a major currency like Zcash or Monero.